Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

The description goes far beyond the sparse annotations: it discloses no API key required, key prefix, sandbox capabilities, deterministic failure triggers, IP-based daily limit behavior, and the fact that keys do not expire from use. This is rich behavioral context that annotations do not provide. No contradiction with annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is long but densely informative, with each sentence earning its place: purpose, usage trigger, sandbox behavior, safety warning, deterministic error triggers, and rate-limit handling. It is well-structured in focused paragraphs and front-loaded with the core action.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Despite having no output schema, the description tells the agent what the key looks like, what it simulates, how to exercise failure paths, when to warn the user, and what error to expect under rate limiting. For a sandbox provisioning tool with a single optional parameter, this is complete enough for correct invocation and result interpretation.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so the optional 'name' parameter is already fully documented as an optional label. The description does not add parameter-specific detail, but with full schema coverage the baseline of 3 is appropriate; it does not need to compensate for schema gaps.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific verb ('Provisions'), a specific resource ('a Lunium TEST api key'), and the key conditions (no credentials, no approval, no cost). It also distinguishes itself from the sandbox demo siblings by noting which tool is for keyless demo mode inside ChatGPT.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

It gives an explicit trigger condition ('erro="chave_ausente"') and explains exactly when to use this tool instead of stopping to ask the user for credentials. It also names two alternatives (lunium_start_sandbox_demo, lunium_get_sandbox_demo) and instructs the agent to reuse an existing key rather than create another.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.